JP2002355243A - X-ray ct unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an X-ray unit which can reduce a load on an operator upon positioning a subject, improve safety of eyes of the subject, and quickly move to measurement operation after positioning. SOLUTION: A video camera placed facing from a side of a subject toward the body axis direction of the subject, a support to rotatably support the video camera centering on the axis of the center of the imaging field of the video camera, a rotation drive means to rotate the video camera centering on the center axis, and a rotation angle control means to detect and control a rotation angle of the video camera are equipped on a gantry. Not really existing virtual line is superposed on an image displayed on the display screen of a display equipped on an operating room. The video camera is equipped with a tilt angle adjustor to rotate the video camera in a direction reverse to a tilt angle by equal quantity with the tilt angle simultaneously with tilt motion of the gantry and to rotate the virtual line in a same direction with the tilt angle by equal quantity centering on the image center on the display screen of the display synchronized with tilt motion of the gantry.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray CT apparatus, and more particularly to a technique for positioning a subject.

[0002]

2. Description of the Related Art Conventionally, positioning has been performed by turning on a light projector (mainly a laser light projector in recent years) in a gantry and adjusting a position of interest of a subject to a line of the light projector.

[0003]

However, according to the above-mentioned prior art, the operator enters the imaging room and adjusts the position of the subject to the line of the projector by operating the operation panel switch of the gantry. And moving between the operation rooms. In addition, if the subject moves while the operator returns to the operation room, it cannot be confirmed from the operation room, and there is a risk that scanning may be performed with an incorrect positioning state. Furthermore, the act of looking at the laser beam of the floodlight is somewhat harmful to the eyes. In addition, when the subject looks at the laser beam, his or her eyes may be closed. At this time, the subject often feels uneasy.
An object of the present invention is to provide a technique capable of quickly and accurately positioning a subject while reducing burden, danger, and anxiety on an operator and the subject. The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0004]

SUMMARY OF THE INVENTION Among the inventions disclosed in the present application, the outline of a representative one will be briefly described.
It is as follows.

According to a first aspect of the present invention, there is provided a video camera arranged from the side of the subject toward the subject's body axis, and the video camera can be rotated about the center of the field of view of the video camera. A support base for supporting the video camera, rotation drive means for rotating the video camera about the center axis, and rotation angle control means for detecting the rotation angle of the video camera and controlling the rotation angle are attached to the gantry, An X-ray CT apparatus that superimposes a virtual line that does not actually exist on an image projected on a display screen of a display device (display monitor) provided in an operation room, wherein the video camera is a gantry. The virtual line is rotated by the same amount in the direction opposite to the tilt angle at the same time as the tilt operation, and the virtual line is centered on the image center on the display screen of the display device in synchronization with the gantry tilt operation. Those having a tilt angle adjusting means is rotated by the same amount to the tilt angle in the same direction.

A second invention is the X-ray CT according to the first invention.
In the apparatus, the user can remotely control the vertical movement of the couch / back and forth movement of the couchtop and the gantry tilt operation from the central desk in the operation room while watching the image of the subject reflected on the display screen of the display device. It has means for positioning the subject by matching the position of interest of the subject with the virtual line.

According to the present invention, up / down movement of the bed / back and forth movement of the couchtop and tilt movement of the gantry can be remotely controlled from the operation room without using a laser projector, and can be performed on the display screen of the display device. By aligning the virtual line of the subject with the position of interest of the subject, positioning is performed without using a laser projector, so that the burden, danger, and anxiety on the operator and the subject are reduced, and a quick and accurate The examiner can be positioned.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings together with embodiments (examples) of the invention. In all the drawings for describing the embodiments of the present invention, components having the same functions are denoted by the same reference numerals, and their repeated description will be omitted.

(Embodiment) FIG. 1 shows an embodiment of the present invention.
FIG. 2 is a schematic side view showing a main part of the configuration of the line CT apparatus.
It is a perspective view of. 1 and 2, 1 is a video camera, 2 is a support base (attached to a rotating plate of a gantry), 3-1 is a pulley, 3-2 is a belt, 3-3 is a pulley, and 3-4 is a pulley. The motor, 4 is a rotation angle detector (rotary encoder), 5 is a tilt angle detection unit, 6 is a rotation center axis of a rotating plate, 7 is a slice plane, 8 is a rotating plate attached to a gantry, and 9 is a subject. Reference numeral 10 denotes a top plate.

The X-ray CT apparatus according to the present embodiment is shown in FIGS.
As shown in FIG. 1, an X-ray tube device, a detector, and the like (not shown) are mounted on a rotating plate 8 provided in the gantry, and are supported so as to be rotatable about a rotation center axis 6. FIG. 1 shows the rotating plate 8 in a stopped state (standby state).

On the gantry, a video camera 1 arranged from the side of the subject 9 toward the subject's body axis, and the center O of the field of view of the video camera 1 as a central axis 6 A support base 2 for rotatably supporting the video camera 1; and rotation driving means (a pulley 3-1 and a belt 3) for rotating the video camera 1 about the central axis 6.
-2, pulley 3-3, and motor 3-4).
A rotation angle detector (rotation angle control means: rotary encoder) 4 for detecting the rotation angle of the video camera 1 and controlling the rotation angle is provided.

In the video camera 1, the center of the field of view of the video camera 1 is the intersection O of the slice plane 7 and the rotation center axis 6 (ie,
(Scan center), and is attached to the rotating plate 8 via the support base 2 so as to be rotatable around the intersection O. A pulley 3-1 is attached to the video camera 1, and the video camera 1 is rotated by a motor 3-4 via a belt 3-2 and a pulley 3-3. The pulleys 3-1 and 3-3 have the same pitch diameter.

The rotation angle of the video camera 1 is detected by a rotation angle detector (rotary encoder) 4, and the rotation angle is controlled by controlling the rotation angle of a motor 3-4 by a motor controller (not shown). . Now, if the gantry (that is, the rotating plate 8) performs a tilt operation,
The motor controller detects the information of the tilt angle detection unit 5 in the gantry, and rotates the video camera 1 by the same amount in the direction opposite to the tilt direction. That is, the attitude of the video camera 1 is not affected by the tilt of the gantry.

The video camera 1 arranged as described above
Takes an image of the subject 9 inserted into the gantry by moving the couch top 10 in the up / down / front-back direction. The captured video information is transmitted to a capture board 11A provided in the central console 11 shown in FIG. And a display circuit (display circuit) 11
The image of the subject 9 is displayed on the display screen of the display monitor (display device) 11D via C. The image of the subject 9 shown in FIG. 4 is the image.

At the same time, a tilt angle signal from the tilt angle detecting section 5 is processed by a central processing unit (CPU) 11B provided in the central console 11, and then transmitted to a vertical line via a display circuit 11C. 12 and horizontal line 13
Is displayed on the display screen of the display monitor (display device) 11D. FIG. 4 shows the vertical line 12 and the horizontal line 13 when the gantry is tilted backward by θ degrees. When the tilt angle is 0 degrees, the vertical line 12 is displayed vertically and the horizontal line 13 is displayed horizontally. The intersection O 'of the vertical line 12 and the horizontal line 13 coincides with the above-described scan center point O, and the point O' does not move on the display screen of the display monitor (display device) 11D. Only the vertical line 12 and the horizontal line 13 rotate about the point O 'in synchronization with the tilt.

As described above, the invention made by the present inventor is:
Although specifically described based on the embodiments of the present invention, the present invention is not limited to the embodiments of the present invention, and it is needless to say that various modifications can be made without departing from the gist of the present invention. .

[0017]

As described above, according to the present invention,
It is possible to remotely control the couch from the operation room, remotely tilt the gantry, and align the subject on the display screen of the display device with the virtual vertical and horizontal lines, thereby positioning the subject. it can. In addition, since there is no movement between the operator's operation room and the photographing room, the measurement operation can be quickly started after the positioning according to the present invention. In addition, since the conventional laser projector is not used, it is safe for the eyes and there is no need to close the eyes, so that the anxiety of the subject can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing the main components of an X-ray CT apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view of FIG.

FIG. 3 is a block diagram illustrating a configuration of control means for displaying a virtual line and displaying a subject image according to the embodiment;

FIG. 4 is a diagram showing a display screen on a display monitor of the embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Video camera 2 ... Support base 3-1 ... Pulley 3-2 ... Belt 3-3 ... Pulley 3-4 ... Motor 4 ... Rotation angle detector (rotary encoder) 5 ... Tilt angle detection part 6 ... Rotation of rotation plate Central axis 7 ... Slice plane 8 ... Rotating plate 9 ... Subject 10 ... Top plate 11 ... Central console 11A ... Capture board 11B ... Central processing unit (CPU) 11C ... Display circuit 11D ... Display monitor (display device) 12 ... vertical imaginary line 13 ... horizontal imaginary line

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Sou Ishii 1-1-1 Uchikanda, Chiyoda-ku, Tokyo F-term in Hitachi Medical Corporation (reference) 4C093 AA22 CA17 CA18 CA33 EC46 EE16

Claims (2)

[Claims] 1. A video camera arranged from the side of a subject in the direction of the subject's body axis, and a support for rotatably supporting the video camera around a center of a field of view of the video camera as a center axis. A stand, a rotation drive unit for rotating the video camera around the central axis, and a rotation angle control unit for detecting a rotation angle of the video camera and controlling the rotation angle, and are provided in the operation room. An X-ray CT apparatus that superimposes and displays virtual lines that do not actually exist on an image projected on a display screen of a display device, wherein the video camera is in a direction opposite to a tilt angle simultaneously with a tilt operation of a gantry. The imaginary line is rotated by the same amount in the same direction as the tilt angle around the center of the image on the display screen of the display device in synchronization with the gantry tilt operation. X-ray CT apparatus characterized by comprising a preparative angle adjusting means. 2. While watching an image of a subject reflected on a display screen of the display device, remotely controlling a vertical movement of a couch / back and forth movement of a couchtop and a gantry tilt operation from a central desk in an operation room; 2. The X-ray CT apparatus according to claim 1, further comprising means for positioning the subject by aligning the position of interest of the subject with the virtual line.